Steam-boiler.



No. 823,399. PATENTED JUNE 12, 1906. J. A. DOARNBBRGER.

STEAM BOILER.

APPLICATION FILED JULY 25, 1905.

4 SHEETS-SHEET 1.

PATENTED JUNE 12, 1906.

J. A. DOARNBERGER.

STEAM BOILER. APPLICATION FILED JULY 25, 1905.

4 SHEETS-SHEET 2.

( luueufoz than,

4 SHEETS-SHEET 3.

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PATENTED JUNE 12 J. A. DOARNBERGBR. STEAM BOILER.

APPLICATION FILED JULY25, 1905.

PATENTED JUNE 12, 1906.

J. A. DOARNBERGBR.

STEAM BOILER.

APPLIOATIOH rum) JULY 25. 1905.

4 SHEETS-SHEET 4.

m w ill. WM

JOHN ADAM DOARNBERGER, OF ROANOKIE, VIRGINIA.

STEAM-BOILER.

Specifi ation of Letters Patent.

Patented June 12, 1906.

Application filed July 25,1905. Serial No. 271,190-

To all whom, it ma l concern.-

Be it known that I, JOHN ADAM DOARN- BERGER, a citizen ofthe UnitedStates, residing at Roanoke, in the county of Roanoke and State ofVirginia, have invented certain new and useful Improvements inSteam-Boilers; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to certain new and useful in. rovements insteam-boilers, and particulary to the means employed to secure andmaintain a water-tight joint between the flues or tubes and theflue-sheets.

My invention has for its object to provide a joint between the fiues ortubes and the flue-sheet which will dispense with the necessity ofassing the end of the tube entirely through tlie flue-sheet and beadingit upon the outside surface of the same, as has been the usual custom,and in providing means for preventing such vibration of the tubes asmight tend to loosen such joints; and with these ends in view myinvention consists in the details of construction and arrangementhereinafter more fully set forth.

In order that those skilled in the art to which my invention appertainsmay know how to make the same and fully ap reciate all of its advantaes, I will proceed to describe the same, re erring by numerals to theaccompanying drawings, in which Figure 1 is a vertical section of alocomotive-boiler illustrating the application of my invention. Fig. 2is a transverse section on the line a; m of Fig. 1. Fig. 3 is anenlarged section of the boiler-sheet, showing more particularly myinvention. Fig. 4 is a similar view of a modification. Fig. 5 is asimilar view of afurther modification. Fi 6 is an enlarged. detail viewof a tube and ue-sheet before the end of the tube is rolled or pressedinto the seat in the tube-sheet. I Fig. 7 is an enlarged detail viewshowing the tube pressed into the seat in the tube-sheet. Figs. 8 and 9are views similar to Figs-6 and 7 and showing a modification, and Fi s.10 and 11 are similar viewsjshowing a furt er modification.

Similar reference-numerals indicate like par'tsin the several figures ofthe drawin s.

' describing my invention such parts lustratq Aggy? 9 be understood asforming 110 n the drawings as are not specifically the fire-box sheet;but it will be un erstood part of my invention and as being of the usualor well-known form.

As already stated, my invention is especially designed to avoid thenecessity of proj ecting the ends of the tubes entirely through theflue-sheet and beadin the projecting ends over and against the s eet, ashas been most usual in the construction of boilers, and at the same timeto provide means for reventing the usual vibrations of thetu es, whichhas been one of the most prolific causes of leaky joints.

In the accompanying drawings I have shown my invention as especially aplied to that the same construction is also to the front sheet.

1 is the front tube-sheet, and 2 is the back or fire-box sheet.

3 re resents the ordinary flues extending from t e front to the backsheet. The flue applicable sheet (one or-both) is bored to receive theends of the fiues in the manner best shown on enlarged scale at Fig. 6,so that for about twothirds of the thickness of the sheet the holetherein is substantially e u'al in diameter with the outside diameter 0the flue and the remaining portion of such hole is of a diameter greaterthan the inside diameter of the flue and less than the outside diameter,thus constituting an annular shoulder 4, againstwhich the end of theflue abuts when properly located in the sheet. A circumferential recessor seat 5 is formed by any suitable tool centrally of the hole in thesheet, and this recess or seat is preferably rectangular incrosssection, as shown at Fig. 7, but, if desired, mayQbe of the formshown in Fig. 8. The preferred form, however, secures a much tighterjoint, although the form shown at Fig. 8 secures a joint much moreeffective than the ordinary joint produced by passing the flue entirelythrough the sheet and turning over or beading theprojecting portion, ashas been most common in the construction of boilers.

When the flue has been located within the sheet, as clearly shown atFigs. 6 and 8, it is then expanded ,by the use of anysuitable tool orappliance into close contact with the sheet, as c earl shown in Figs. 7and 9, the end of the flue orced into the seat or recess 5, anditseXtremitylOcated behind the shoulder 4 and in'close contacttherewith, thus not only producing a tight joint but at the same time I10 protecting the extreme end of the flue from direct contact with thefire-box gases, and the ends of the flues'are also more thoroughlprotected by the water circulation. It wifi also be seen that inexpandin the ends of the fines as described and forcing a part thereofinto the annular recess or seat a sl' ht flare is given to the ends ofthe fines, which tends to properly lead the draft from the firebox. Inthe modification shown in Figs. and 11 a copper ring 6 is located in theannular recess 5 and-the end of the flue is rolled into close contacttherewith, and the tube is also preferably expanded circumferentiallyimmediately .behind the sheet, as clearly illustrated, whereby acepper-packed and very tight jointis produce Whi e such joints as I havedescribed are much more effectiveto prevent leaks than the ordinaryjoint made by expanding the fines and beading the projecting ends, still4 with the increased length of flues rendered .necessary in the modernlocomotives the inauxiliary or reinforcin tube-sheet 7,

- ends of said bolts polygonal project which is bored to receive ansustain the flues 3, which are set and rolled in the said auxiliarysheet, as shown, and which is located about eight inches'(more or less)from the main tube-sheet 2. This auxiliary or reinforcing tube-sheet hasno direct connection with any other portion of the boiler except themain tube-sheet and is connected therewith by a series of suitable bolts8, formed with shoulders 9, to contact with the auxiliary or reinforcintube-sheet 7 and secured thereto by threa ed nuts 10, the opposite beingthreaded and formed with a head 11 and secured in the flue-sheet 2 bymeans of a suitable tool applied to the portion 12. .From thisconstruction it will e seen that the auxiliary or reinforcing flue-sheet7 is permitted to travel with the expansion and contraction of the mainflue-sheet, while at the same time it in no wise affects the freecirculation of water .on all sides.

The auxiliary or reinforcing flue-sheet renders the- .flues absolutelystiff and rigid throughout that portion thereof between said auxiliaryflue-sheet and the main fluesheet, and hence the joint between the finesand the latter sheet are not affected by the vibration usually occurringin boilers as atas for the purpose ereinbefore set forth.

. ceases present constructed, and consequently with a joint primarilytight any tendency to leakage is avoided, and particularly so when thejoint is of the character shown and described.-

W'hile I have shown and prefer to thread the bolts 8 through the mainflue-sheet, as shown in Figs. 4 and 5, they may be tapered and headed,as shown in Fig. 3, and, as shown in this figure, a ferrule 13 may beemplo ed to bridge the space between the two uesheets as a substitutefor the shoulder 9. (Shown in Figs. 4 and 5.) These bolts are located,preferably, as shown in Fig. 2; but I of course do not wish to belimited to any special location or number of bolts so long as theyperform the function described.

In Fig. 5 I have shown an arrangement of bolts and nuts by means ofwhich both of the main flue-sheets and the auxiliary or reinforcingsheet ma be tied together and in which extension-bolts 14, a right andleft threaded nut 15, a shoulder-nut 16, and tightening-nut 17 areemployed; but I do not wish to be confined to any special detail ofconstruction in so far as the stay-bolts are concerned, the enericfeatures of my invention residing in the broad idea of the auxiliary orreinforcing fluesheet 8, tied and connected with the main flue-sheet,and or tied in both the main flue-sheet and the auxiliary or reinforcingsheet to prevent the usual vibration at the ends of the flues and theconsequent movement of the joints and tendency to leakage.

I have found from practical experience that the presence in thewater-space of this auxiliary or reinforcing flue-sheet tends toincrease the water circulation around the ends of the fines next to thefire-box or furnace, and hence carries away the heat at that point morerapidly than in the ordinary construction, and that the formation ofscale is reduced to the minimum.

It will be understood that while I prefer to employ such joints betweenthe flues and the flue-sheet as I have shown my improved auxiliaryflue-sheet and stay-bolts maybe advantageously employed in connectionwith any well-known joint, as the presence of the auxiliary flue-sheetstayed and tied to the main flue-sheet serves to prevent that vibrationof the fines which necessarily tends to I open the joints in the mainflue-sheet. v

Having described the constructionand advantages of my improvements, whatI claim as new, and desire to secure by Letters Patent, is 1. In asteam-boiler, the combination with a flue-sheet having the ends of theflues joined thereto by a suitable rolled joint; an auxilia flues ro edtherein; and stay-bolts ri idly connected with the main flue-sheet anthe auxiliary or reinforc' sheet, substantially the fines rolled IIO 25reinforcing tube-sheet having the '2. In a steam-boiler, the combinationwith a flue-sheet having openings of different diameters to produceannular shoulders and formed with an annular recess between said annularshoulders and the opening of largest diameter in the tube-sheet, flueslocated within the openings of the largest diameter and with the extremeends or terminals abutting against the annular shoulders of thetubesheet and with their circumferential walls in rear of theirterminals or ends rolled into the annular recesses in the tube-sheet andinto alinement with the opening of smallest diameter of the tubesheet,substantially as hereinbefore set forth.

3. In a steam-boiler, the combination with a flue-sheet havingflue-openings of different diameters and producing annular shoulders andwith annular recesses adjacent to said shoulders; tubes located in thetube-sheet and with their extreme ends abutting against the annularshoulders of the tube-sheet; copper packing-rings located in the annularrecesses in the tube-sheet, and the body of the tubes in rear of theirextreme ends rolled into the annular recess of the tube-sheet and intocontact with the copper packing-rings and in alinement with the openingsof smallest diameter in the flue-sheet, substantially as and for thepurpose set forth.

located in the openings of the flue-sheet and o with their ends abuttingthe annular shoulders and rolled into the annular recesses; and areinforcing flue-sheet adjacent to the main fiue-sheet/ and firmlyattached thereto by suitable stay-bolts and having the flues rolled intothe flue-openings of said reinforcing fluesheet, substantially as andfor thepurpose set forth.

5. In a steam-boiler, in combination with front and back flue-sheets andllues having their ends suitably joined to said sheets; an intermediateflue -.sheet disconnected from the boiler with the fines rolled therein.and rigidly tied or fixed in relation with the front and reartube-sheets by stay-bolts, substantially as hereinbefore set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witn esses.

JOHN ADAM DOARNBERGER.

Witnesses:

W. H. LEWIS, JOHN A. PILGHER.

